Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
ET1 U2 L2
How to verify proper grounding of electronic equipment
| Question | Answer |
|---|---|
| What is the length and diameter of a typical grounding rod? | 10 feet long by 3/4 inch diameter |
| Which ofthe following metals should NOT be used in the construction of down conductors? | Tin |
| The metal framework of a building should have a resistance of less than _____ ohms? | 10 |
| Which class of bonding involves welding of two pieces of metal together? | Class A |
| DC resistance across bonding and grounding junctions shall NOT exceed _____ ohms? | .1 |
| When installing an eath electrode subsystem, which wire color denotes the grounding conductor? | Green |
| Which of the following references is NOT used when inspecting a fault protection subsytem? | Civil engineering manual |
| To protect a structure, such as abuilding, vessel, mast, etc... from lightning damage; the grounding cable should be _____ AWG? | 0000 |
| List the primary advantage of using a floating ground subsystem | Prevents noise from being coupled to signal circuits |
| What is the recommended frequency range for a single-point ground configuration? | Up to 300Khz |
| Which sybsystem should NOT be considered an option when developing the earth electrode subsystem? | A direct bond between two similar metals on top of the soil |
| RF impedance across bonding and grounding junctions shall not exceed _____ ohms? | 25 |
| Should zinc be used when grounding an electrode? | No |
| If a lightning strike produces 220Kv approximately how much voltage will subsequent strikes produce? | 110Kv |
| Does VHF use a signal reference grounding system? | No |
| What class bond uses bolting or clamping? | Class B |
| What class bond uses bridging using a cunductive strap? | Class C |
| Measure the resistance every ____ months of the earth electrode subsystem | 12 |
| electrode conductors may be | solid, stranded, insulated, covered, bare wires |
| fault protection devices include | fuses, circuit breakers, ground fault sensors, ground fault circuit interrupters (GFCI) |
| fault sensors do what? | monitor current |
| GFCI does what? | monitor the current supplied from the source and are very sensitive. |
| effects by lightning strike include | thermal, mechanical, electrical, conductor impedance, induced voltage |
| air rterminal does what? | attracts lightning away from building |
| air termainal mounting on a flat roof? | on the corner edges |
| air terminal on a pitched roof | within two feet of redged ends |
| air terminal mounting on a sloping roof | on corners and edges with terminals less tjan 24" are spaced at a max 20' apart; equal or greater than 24" in height spaced at a maximum 25 ft apart |
| bends of down conductors | not less than 90 degrees or radius of 8 inches |
Created by:
filoblack
Popular Military sets